Usain Bolt has become just the second man in history to win back-to-back 100m titles after running an extraordinary 9.63 seconds to smash his own Olympic record and run just 0.05 seconds off the world record.
In the fastest Olympic final ever, Bolt’s training partner Yohan Blake finished second in a personal best 9.75sec with 2004 Olympic champion Justin Gatlin third, also in a personal best 9.79sec.